Re: Sad Day game no longer runs
There are two ways:
1. You can use a built-in function called Bootcamp
https://support.apple.com/en-au/boot-camp to install Windows on a seperate partition on your Mac, and then launch to that partition and use it as a Windows laptop to play SO.
2. Or you can use a program like Parallels, which allows you to run Windows virtually at the same time as being logged into your Mac, but you would need a good Mac to play games while doing that (post-2015, MacBook Pro with dedicated GPU, at least).
Both of these ways would require buying a license to Windows 10 so you could install it.